These ultra slim AirFlex knee guard scores a total of 15 points in the Leatt protection rating system. Do not be fooled by these ultra slim knee guards. They offer great impact protection and a slim fit. Our 6mm thin knee pads are CE certified as impact protection. 6mm!!! The slimmest, lightest knee guard made by Leatt, now with additional side and upper knee impact protection. Next step up in safety is the Knee Guard 3DF Hybrid which gets 17 points.